Sympathetic stimulation increases
A)end-diastolic volume.
B)stroke volume.
C)end-systolic volume.
D)blood vessel volume.

Question

Quizplus · Accepted Answer

Sympathetic stimulation increases contractility of the heart, leading to an increase in stroke volume (the amount of blood ejected from the heart with each beat). Option A is incorrect because end-diastolic volume is the amount of blood in the ventricles at the end of diastole (relaxation), which is affected more by factors such as venous return rather than sympathetic stimulation. Option C is incorrect because end-systolic volume is the amount of blood remaining in the ventricles at the end of systole (contraction), which would decrease with sympathetic stimulation due to increased ejection fraction. Option D is incorrect because sympathetic stimulation can cause vasoconstriction, leading to a decrease in blood vessel volume.

Sympathetic Stimulation Increases